If you go to settings and look to the keyboard stuff, there should be an option for "Show Keyboard & Character Viewer in menu bar" or such. Enable that and then you can get the keyboard viewer from the icon in the menu bar. That will show you what keys will result in which characters (it changes by locale). For me, alt/option-o gives the ø character, which *appears* to be what you want. (Might be a different unicode value... I did not check)
@ Jon
I think You are describing how to do it in the aqua environment. Using inkscape on a mac, I have to use the X11 surroundings.
@all
After some googleing I think it is not so easy to generate characters which are done with AltGr on non-macs. Unluckily on my machine neither copy-paste from X11 to aqua and vice versa works - nor can I import text into inkscape… )-:
Easiest workaround seems to type the unicode hex code ( ctrl-U-<hex code> Enter ) - not really satisfying…
Yours
Wolf